Top-entry check valve with pin fasteners

ABSTRACT

A top-entry check valve having a valve body, a valve cartridge assembly and a removable bonnet utilizes pin fasteners to prevent movement of the valve cartridge assembly in the downstream direction. The valve cartridge assembly includes a seat, a cage, a disc and a pair of downstream extensions. A fastener slot extends through each downstream extension of the valve cartridge assembly and the valve body has a mating opening corresponding to each fastener slot. Insertion of a pin fastener through each fastener slot and into the corresponding mating opening prevents the valve cartridge assembly from moving in the downstream direction. An annular shoulder in the valve body prevents movement of the seat, cage and disc in the upstream direction. The disc has a hinge pin which is cradled in hinge pin supports of the cage to hold the disc in place. Removal of the bonnet allows access to the valve chamber for replacement of the seat, cage, disc or pin fasteners.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a division of application Ser. No. 07/762,539, filedSept. 18, 1991.

This application is related to the following applications filed on Sept.18, 1991:

Top-Entry Check Valve Having Retainer Ring, Ser. No. 07/762,104.

Top-Entry Check Valve With Threaded Fasteners, Ser. No. 07/762,540.

Top-Entry Check Valve With Screw-In Seat, Ser. No. 07/762,514.

Top-Entry Check Valve Having Spring Retainer, Ser. No. 07/762,517.

Top-Entry Check Valve With Cartridge Secured By Projections, Ser. No.07/761,594, now U.S. Pat. No. 5,143,113.

Top-Entry Check Valve With Cartridge Secured By Threaded Projections,Ser. No. 07/762,811, now U.S. Pat. No. 5,143,112.

This application is also related to application Ser. No. 07/878,093,filed May 4, 1992, entitled Top-Entry Check Valve With Cartridge SecuredBy Projections, which is a division of application Ser. No. 07/761,594.

FIELD OF THE INVENTION

This invention relates to improvements in top-entry swing check valves.

SUMMARY OF THE INVENTION

The present invention provides a top-entry check valve with a smooth,straight chamber which minimizes both turbulence and pressure drop ofthe fluid passing through the valve. The relatively small cavity of thisdesign allows an overall reduction in size and weight over conventionaltop-entry check valves.

The cartridge assembly of the valve includes a seat, a cage and a disc.The seat and cage are a unitary structure in order to make replacementof the seat and cage more easily accomplished through an access openingin valve body.

A removable bonnet is attached over the access opening to the valvechamber. With the bonnet detached, the seat, cage and disc can readilybe replaced.

An annular shoulder in the valve chamber prevents the valve cartridgefrom moving in an upstream direction. A pin fastener engages the valvebody and valve cartridge to hold the valve cartridge against movement ina downstream direction.

Additional advantages and features of the present invention will becomeapparent from the detailed description of the preferred embodiments ofthe invention when read in conjunction with the drawings and appendedclaims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a vertical cross-sectional view of a prior art top-entry checkvalve with turbulent flow.

FIG. 2 is a vertical cross-sectional view of a top-entry check valveconstructed in accordance with the present invention and illustratingthe smooth flow through the valve chamber.

FIG. 3 is a side elevation of a top-entry check valve constructed inaccordance with the present invention with a prior art top-entry checkvalve shown in outline to illustrate the improved dimensions of thepresent invention.

FIG. 4 is a vertical cross-sectional view of a portion of a top-entrycheck valve constructed in accordance with the present invention.

FIG. 5 is a cross-sectional view taken along lines 5--5 of FIG. 4.

FIG. 6 is an elevational view of a unitary seat and cage of the valve ofFIGS. 4 and 5 from the downstream side.

FIG. 7 is a side elevation of the unitary seat and cage of FIG. 6.

FIG. 8 is an elevational view of the unitary seat and cage of FIG. 6from the upstream side.

FIG. 9 is an elevational view of the disc of the valve of FIGS. 4 and 5from the downstream side.

FIG. 10 is a side elevation of the disc of FIG. 9.

FIG. 11 is an elevational view of the disc of FIG. 9 from the upstreamside.

FIG. 12 is a vertical cross-sectional view of another form of top-entrycheck valve constructed in accordance with the present invention.

FIG. 13 is a cross-sectional view taken along lines 13--13 of the valveof FIG. 12.

FIG. 14 is a side elevation of the unitary seat and cage of the valve ofFIGS. 12 and 13.

FIG. 15 is a vertical cross-sectional view of another form of top-entrycheck valve constructed in accordance with the present invention.

FIG. 16 is a cross-sectional view taken along lines 16-16 of the valveof FIG. 15.

FIG. 17 is a side elevation of the unitary seat and cage of the valve ofFIGS. 15 and 16.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring now to the drawings in detail, and to FIG. 1 in particular,the reference numeral generally designates a prior art-top entry checkvalve. Flow into the valve 10 is indicated by the straight arrows 11. Asillustrated by the swirling arrows 12, turbulent flow is created by thehigh bonnet 14 and large cavity 16. This construction requires machininginside the valve body for the hinge 18 and valve seat 19.

FIG. 2 illustrates a typical top-entry check valve 20 constructed inaccordance with the present invention. Flow into the valve 20 isdesignated by the straight arrows 21. The arrows 22 illustrate thesmooth, even flow through valve 20. The improved flow is a result of therelatively straight lines of the valve body 24. The bonnet 26 forms thetop wall of the valve chamber 28, such that there is virtually no cavitybetween the bonnet and the valve chamber, as contrasted with theexistence of a cavity 16 in the prior art valve 10. The distance fromthe center-line 27 of the body 24 to the bottom of the bonnet 26 isapproximately the same as the distance from the center-line to thebottom of the valve chamber.

FIG. 3 is a comparison of a conventional, prior art top-entry checkvalve 10 (partially in outline) and a check valve 20 constructed inaccordance with the present invention (shown in full lines). Thiscomparison illustrates the reduction in size and weight accomplished bythe present invention. The drawing also shows the use of flanges 29 atthe upstream and downstream ends of the valve 20, although it will beunderstood that the valve body 24 can be fitted with any desiredconnecting arrangement.

It will also be understood that the following embodiments include theuse of standard seals, such as elastomeric O-ring seals, to providefluid-tight engagement between various surfaces. Such seals areinstalled in a conventional manner where needed to prevent leakage offluid between the valve components. These seals are omitted from thedrawings in order to illustrate more clearly the preferred embodimentsof the present invention.

EMBODIMENT OF FIGS. 4 AND 5

In FIGS. 4 and 5, the central portion of a valve 20 constructed inaccordance with the present invention is shown enlarged. As shown inthese figures, the valve chamber 28 receives a valve cartridge assembly,generally designated by reference character 30. The valve cartridgeassembly 30 controls the flow of fluid through the valve 20. The valvecartridge assembly 30 basically comprises a unitary valve seat and cagemember 34 and a valve disc 36 supported on the member 34. As best shownin FIG. 5, an access opening 39 allows installation and removal of thevalve cartridge assembly 30, when the bonnet 26 is detached from thevalve body.

The unitary seat and cage 34 of the valve 20 is shown separately inFIGS. 6, 7 and 8. The seat/cage 34 is generally circular with a flowopening 42 therethrough. An annular seating face 44 around the flowopening 42 is sized and shaped to mate with the disc 36. A pair of hingepin supports 46 extend generally radially in the seat/cage 34 to suspendthe disc 36 in the valve cartridge assembly 30. As best shown in FIG. 7,a reduced diameter extension 47 is formed on the upstream end 48 of theunitary seat and cage 34 and an annular shoulder 49 extends around theunitary seat and cage member 34. A recess 50 in the form of acircumferential groove is formed in the outer surface of a medialportion of the reduced diameter extension 47. FIG. 7 also illustratesthat the hinge pin supports 46 ar generally U-shaped in cross-section.

The disc 36 of the valve 20 is shown separately in FIGS. 9, 10 and 11.The disc 36 is a generally circular flat plate 52. At least one hingepin 54, with end portions 56, extends at a tangent from the plate 52. Asdiscussed hereinafter, the end portions 56 of the hinge pin 54 pivotallysupport the disc 36 within the valve 20.

The arrangement of the valve cartridge assembly 30 in the valve chamber28 is disclosed in FIGS. 4 and 5. As described hereinabove, the valvecartridge assembly 30 comprises the unitary seat and cage member 34 andthe valve disc 36. The reduced diameter extension 47 of the unitary seatand cage 34 fits into a mating counterbore 72 of the valve body 24. Thecounterbore 72 forms an annular shoulder 74 facing downstream to matewith the upstream end 48 of the seat and cage 34. This arrangementprevents movement of the valve cartridge assembly 30 in the upstreamdirection indicated by arrow 76.

As best illustrated by FIG. 4, the hinge pin supports 46 of the unitaryseat and cage member 34 cradle the end portions 56 of the hinge pin 54of the disc 36 to suspend the disc 36 within the valve cartridgeassembly 30. The disc 36 pivots about the axis of the hinge pin 54 toclose against the seating face 44 of the unitary seat and cage member 34to prevent flow through the valve cartridge assembly 30 in the upstreamdirection 76. Conversely, the disc 36 pivots about the axis of the hingepin 54 to open away from the seating face 44 of the unitary seat andcage 34 and allow unobstructed flow through the valve cartridge assembly30 in the downstream direction 32. The hinge pin supports 46 of theunitary seat and cage 34 are bent over to trap the end portions 56 ofthe hinge pin 54 of the disc 36. It should also be noted that the widthof each hinge pin support 46 is larger than the diameter of the hingepin 54 which allows the disc 36 to "float" when in a near-closedposition.

Continuing to refer to FIG. 4, the valve body 24 has a pin fasteneropening 82 therethrough extending from the top 84 of the valve body 24into the mating counterbore 72. The pin fastener opening 82 is sized andshaped to receive a pin fastener 86. One end of the pin fastener 86 hasa protrusion 88 which is sized and shaped to fit into the recess 50 ofthe reduced diameter extension 47 of the seat and cage 34.

With the reduced diameter extension 47 of the seat and cage 34 installedin the mating counterbore 72 of the valve body 24, the pin fasteneropening 82 aligns with the recess 50 of the reduced diameter extension47. The pin fastener 86 is inserted into the pin fastener opening 82 andthe protrusion 88 extends into the recess 50. The protrusion 88 of thepin fastener 86 engages the upstream wall of the recess 50 to preventdownstream movement of the unitary seat and cage 34.

As FIG. 5 illustrates, the pin fastener 86 and valve cartridge assembly30 are readily accessible with the bonnet 26 detached. The pin fastener86 can be extracted from the pin fastener opening 82 to allow removal ofthe reduced diameter extension 47 of the unitary seat and cage 34 fromthe mating counterbore 72 of the valve body 24. The valve cartridgeassembly 30 can then be removed from the valve chamber 28 through theaccess opening 39. Installation of the valve cartridge assembly 30 isperformed by simply reversing the steps for removal. This arrangementallows easy replacement of the valve cartridge assembly 30 or of theunitary seat/cage 34 or disc 36 individually.

EMBODIMENTS OF FIGS. 12, 13 AND 14

Referring now to FIG. 12, reference character 20A designates anotherform of a valve constructed in accordance with the present invention.The unitary seat and cage member 34A and the valve body 24A are slightmodifications of the cage member 34 and body 24 previously described.

As shown in FIGS. 12, 13 and 14, the unitary seat and cage 34A has apair of downstream extensions 92 with fastener slots 94 therethrough.Each fastener slot 94 is sized and shaped to receive a pin fastener 96.As best shown in FIGS. 12 and 13, the valve body 24A is formed with apair of lugs 98 extending into the valve chamber 28. The upper surface102 of each lug 98 has a pin fastener opening 104 sized and shaped toreceive one of the pin fasteners 96. With the reduced diameter extension47 of the unitary seat and cage 34A installed in the mating counterbore72 of the valve body 24A, the pin fastener opening 104 of each lug 98aligns with the fastener slot 94 of one of the downstream extensions 92.The insertion of one of the pin fasteners 96 through the fastener slot94 and into the aligned pin fastener opening 104 secures the unitaryseat and cage 34A against movement in the downstream direction 32.

As best shown in FIG. 13, the pin fasteners 96 are readily accessiblewhen the bonnet 26 is detached from the valve body 24A. Extracting thepin fasteners 96 from the pin fastener holes 104 of the lugs 98 allowsthe reduced diameter extension 47 of the seat and cage 34A to be moveddownstream out of the mating counterbore 72 of the valve body 24A. Thevalve cartridge assembly 30A can then be removed through the accessopening 39. This construction permits easy removal and installation ofthe valve cartridge assembly 30A or the seat/cage 34A and disc 36individually.

EMBODIMENT OF FIGS. 15, 16 AND 17

Referring now to FIG. 15, reference character 20B designates anotherform of a valve constructed in accordance with the present invention.The unitary seat and cage member 34B, the valve body 24B and the pin 96Bare modifications of the seat cage member 34A, the valve body 24A andthe pin 96, respectively.

As best shown in FIG. 17, the unitary seat and cage member 34B isidentical to the seat and cage member 34A, except that seat and cagemember 34B has no reduced diameter extension 47. The valve body 24B isexactly like the valve body 24A, except that valve body 24B has nocounterbore 72. As FIG. 15 best illustrates, the pin 96B has an offsetat an intermediate point of its length. An upper offset portion 106 ofeach pin 96B extends through the fastener slot 94 of the correspondingdownstream extension 92 of the seat and cage member 34B. A lower offsetportion 108 of each pin 96B extends into the pin fastener opening 104 inthe respective lug 98 in the valve body 24B. The top surface of the pin96B has a slot 110 for use in turning the pin 96B with a screwdriver orthe like.

As shown in FIG. 16, the offset pins 96B are readily accessible when thebonnet 26 is detached from the valve body 24B. To install the valvecartridge assembly 30B, the assembly 30B is inserted into the valvechamber 28 and each fastener slot 94 is aligned with the correspondingfastener opening 104. The lower offset portion 108 of each pin 96B isinserted into the respective fastener opening 104 with the upper offset106 positioned toward the downstream direction 32. With the offset pins96B in this position, the upstream end 48B of the seat and cage member34B is not tightly secured against the downstream face 48C of the valvebody 24B. The seat and cage member 34B is secured against the downstreamface 48C of the valve body 24B by rotating each offset pin 96B so thatthe upper offset 106 is positioned toward the upstream direction 76 (theposition shown in FIG. 15).

Removal of the valve cartridge 30B from the valve chamber 28 isbasically the reverse of the installation process. With the bonnet 26detached, the offset pins 96B are rotated to a position where the seatand cage member 34B is not tightly secured against the valve body 24B.Then the offset pins 96B are removed from the pin opening 104 and thepin slot 94. The valve cartridge assembly 30B is then free to be liftedout of the valve chamber 28 through the access opening 39.

Changes may be made in the combinations, operations and arrangements ofthe various parts and elements described herein without departing fromthe spirit and scope of the invention as defined in the followingclaims.

What is claimed is:
 1. A top entry check valve, comprising:a valvecartridge assembly, including a seat, cage and disc; a body having anupstream end, a downstream end, a valve chamber therein communicatingwith the upstream and downstream ends thereof, and an access opening ina side wall thereof communicating with the valve chamber of a size toaccommodate the entry and removal of the valve cartridge assemblytherethrough, said body also having an annular shoulder therein facingdownstream sized to engage and prevent the valve cartridge from movingupstream; a bonnet removably attached to the body over said accessopening forming a wall of the valve chamber; and at least one extensionprotruding downstream from the valve cartridge assembly and having afastener slot therethrough; and a pin fastener extending through thefastener slot of each extension of the valve cartridge assembly; whereinthe body has a mating opening corresponding with the fastener slot ofeach extension of the valve cartridge assembly and wherein each pinfastener extends into the corresponding mating opening to hold the valvecartridge assembly against movement downstream.
 2. A valve as defined inclaim 1 wherein the disc is a generally circular flat plate having atleast one hinge pin thereon extending along a tangent to the flat plate,and wherein the seat and cage of the cartridge assembly comprises aunitary structure forming an annular seating face sized to mate with thedisc and a pair of hinge pin supports receiving the opposite endportions of the hinge pin.
 3. A valve as defined in claim 2 wherein eachhinge pin support faces radially with respect to the disc.
 4. A valve asdefined in claim 2 wherein each hinge pin support is generally U-shapedin cross section.
 5. A valve as defined in claim 2 wherein each hingepin support is sized larger than the diameter of the hinge pin wherebythe disc can float in upstream and downstream directions in anear-closed position.
 6. A valve as defined in claim 2 wherein at leasta portion of the outer periphery of the unitary structure fits in amating counterbore in the valve chamber.
 7. A valve as defined in claim2 wherein said hinge pin supports are generally U-shaped incross-section and face radially with respect to the disc, and whereinone side of each hinge pin support is bent over a portion of the hingepin to trap the hinge pin therein.
 8. A valve as defined in claim 2wherein each pin fastener has an offset at an intermediate point of thelength thereof, the offset defining an upper offset engaging thecorresponding extension and a lower offset extending into thecorresponding mating opening and wherein turning each pin fastener withthe upper offset toward the valve cartridge assembly secures the valvecartridge assembly against the downstream facing annular shoulder of thebody.
 9. A valve as defined in claim 8 wherein each pin fastener has aslotted top surface for use in turning the pin fastener.